Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Takanori Fukuyama

Masahide Sumiyama

Kazuki Honda

Koji Sano

Takeshi Shimokawatoko

Kazutaka Kubo

Mitsutaka Enomoto

Hiroshi Yano

Kazuya Yamasaki

Shigeru Tomoeda

Tomoyasu Takase

Masanori Nakano

Mitsukazu Kuze

Shuhei Konishi

Satoshi Itoh

Kazuhiro Yoshida

Masashi Kawabe

Toshiyuki Koike

Masakuni Hirata

Yoshinobu Sengiku

Kouzi Sano

The present invention relates to a loudspeaker in the acoustic field and the information communication field. The invention provides a loudspeaker that can realize a thinner size. To achieve this, the loudspeaker of the present invention is structured so that a part of a diaphragm is inserted to a dent or an opening formed at the center poles of a lower plate of a magnetic circuit. This structure allows the diaphragm to be stored within the height of the magnetic circuit, thus allowing the loudspeaker to have a thinner size.

Speaker and electronic apparatus and device using the same

An electroacoustic transducer has a magnetic circuit, a frame combined with the magnetic circuit, a diaphragm combined with a periphery of the frame, a voice coil, a terminal, and a holder covering the frame. The voice coil is combined with the diaphragm and a part of the voice coil is arranged in a magnetic gap of the magnetic circuit. The terminal, made of a metal plate having spring property and electric conductivity, electrically connects an outside circuit and the voice coil utilizing spring pressure generated when the metal plate is bent. The holder forms a stopper for restricting a bend of the metal plate forming the terminal to within a reversible limit of a metallic material.

Electroacoustic transducer and electronic device using the same

An edge () for supporting a diaphragm assembly () with respect to a frame () is bonded to the frame () along the outer periphery thereof and joined to a diaphragm () in a position more peripherally inward than a voice coil () along the inner periphery thereof. The edge () partly overlaps diaphragm (). This structure allows downsizing of the speaker, without reducing the sizes of a permanent magnet () and the edge ().

Method of manufacturing a speaker

An electro-acoustic transducer has a magnetic circuit, a frame, a diaphragm, a voice coil, a terminal, and a stopper. The frame is joined to a magnetic circuit. The diaphragm is joined to a circumferential edge of the frame. The voice coil is joined to the diaphragm and is partially provided at a magnetic gap of the magnetic circuit. The terminal is composed of a metal plate having spring property and conductivity, is partially fixed to the frame, and is electrically connected to the voice coil. The stopper is provided at an outer periphery of the metal plate of the terminal and extends from a main section of the terminal to the frame. The stopper restricts a bending range of the metal plate constituting the terminal to a level equal to or lower than a reversibility limit value of a metal material constituting the terminal.

Electro-acoustic transducer and electronic apparatus using it

A net made of material containing at least metal is bonded to a protector of a loud speaker, and hence shields electromagnetic waves. Electromagnetic interference can be prevented in an electronic apparatus such as a portable phone employing the loud speaker.

Speaker, and module, electronic apparatus, and device that use the speaker

Speaker, module using the same, electronic equipment and device, and speaker producing method

A loudspeaker is provided that satisfies requirements for both a small size and a high sound pressure. In addition, the heat capacity of the magnetic circuit and the heat dissipation of the voice coil are improved in this loudspeaker. Using at least two pieces of bar magnets (), an outer magnet type magnetic circuit is structured in which the magnetic gap comprising an upper plate () and a lower plate () has a straight section. Also, the configuration of the voice coil () is that of a track.

Loudspeaker, and module and electronic apparatus using the loudspeaker

An electro-acoustic transducer wherein a stopper of a terminal is composed of an elastic body having an impulsive-force resistance and an excellent resilience. The stopper is mounted on the yoke or lower plate of magnetic circuit, which is made of a metallic material having an impulsive-force resistance. In this way, the stopper can restrict the terminal within the reversibility limit value of the spring force of the metallic material, and hence can enhance the reliability.

Electric acoustic converter and electronic device using the same

A speaker includes a substantially rectangular case having connection terminals at corners, a substantially rectangular voice coil, a diaphragm, and a substantially rectangular magnetic circuit. A lead drawn out from a corner of the voice coil in proximity to one of the connection terminals extends to the vicinity of another corner on a shorter side of the voice coil. The lead is bent, and then is connected to the connection terminal. This configuration can provide a speaker for use in portable equipment, such as a portable telephone, that can meet the requirements of space reduction without impairing characteristics, such as sound quality and sound pressure, and has excellent connection reliability of the terminal and reduced cost.

Loudspeaker

The present invention relates to an electric-mechanical-acoustic converter used mainly in a mobile telephone and the like, and its objective is to provide a high-quality product in which damage and degradation of performance caused by shock due to a drop are prevented. In order to achieve this objective, the present invention includes at least one suspension ( ) supporting a movable portion ( ) formed of the magnetic circuit portion ( ) and a weight portion ( ), and a frame ( ) supporting a diaphragm ( ) and the suspension ( ), a space in an elastic deformation range of the suspension ( ) being provided between the outer periphery of the movable portion ( ) and the frame ( ). Even in the case where a portable terminal apparatus is dropped, and the electric-mechanical-acoustic converter built therein is subjected to shock, the outer periphery of the movable portion ( ) is received by the frame ( ), whereby the suspension ( ) can be prevented from being permanently deformed.

Method for producing electric-mechanical acoustic converter

Electric-mechanical-acoustic converter and method for producing the same

An electro-mechanical-audio converter and an electro-mechanical-audio converting device using the same employed in mobile terminals such as mobile phones for generating paging vibration which realizes stable vibration function. The electro-mechanical-audio converter includes a housing ( ), movable part ( ), forming a magnetic circuit, mounted on an opening of the housing ( ) through a suspension ( ); and a detection coil ( ) disposed near the movable part ( ) for generating excitation voltage by vibration of the movable part ( ). Strong vibration of the movable part ( ) during resonance is detected by the detection coil ( ) as an excitation voltage, and fed back. Accordingly, the electro-mechanical-audio converter and electro-mechanical-audio converting device using the same having an extremely stable vibration function, even when resonance frequency changes due to environmental changes such as ambient temperature, is made feasible.

Growing community of inventors

Mie, Japan

Takanori Fukuyama